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.Dd October 17, 2016
.Dt sysdecode_ioctlname 3
.Os
.Sh NAME
.Nm sysdecode_ioctlname
.Nd lookup name of device control command
.Sh LIBRARY
.Lb libsysdecode
.Sh SYNOPSIS
.In sysdecode.h
.Ft const char *
.Fn sysdecode_ioctlname "unsigned long request"
.Sh DESCRIPTION
The
.Fn sysdecode_ioctlname
function returns the name of a device control request identified by
.Fa request .
A table of names is generated during the build of the
.Nm sysdecode
library from system headers that maps device control request values to
the name of the corresponding C macro.
.Sh RETURN VALUES
The
.Fn sysdecode_ioctlname
function returns the name of a device control request if
.Fa request
is a known value;
otherwise
.Dv NULL .
.Sh SEE ALSO
.Xr sysdecode 3
